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Bullnosing, Cranking & Curving of Roof Sheeting

BULLNOSING & CRANKING

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Bullnoses and centre cranks

Bullnosing and centre cranking of a profiled sheet incorporates lateral rib indentations pressed in at uniform distances. Standard bullnoses are made with the narrow flute uppermost and the bend away from the angular inclination. Reverse bullnoses are made with the narrow flute downwards and with the bend into the narrow flute. Bullnoses and cranks can be at the end of a sheet or at any position along the length.

Bullnoses and centre cranks can be done in a radius from 300 mm to 800 mm for bullnoses which are bent through 0 – 180 degrees, larger radii will be classified as a curve.

The maximum sheet length which can be bullnosed is 15 m, with a maximum height of 2 m. The minimum runout from the bullnose is 30 mm on one side with a minimum of 500 mm on the other side of the sheet.

The critical end of a bullnose must be specified in order to ensure consistent lengths.

Due to handling and transport limitations the maximum height of centre and off-centre cranks which can be manufactured is 2 m with a limitation of 12 m total sheet length.

0.50mm Material can only be bullnosed and cranked to a minimum radius of 450 mm.

Care must be taken when ordering bullnoses and curves as there are no broad or narrow flutes on a Corrugated 10.5 sheeting to differentiate between a normal or reverse bullnose.

Two items must be clearly indicated on a Corrugated 10.5 bullnose:

  1. The position of the “lip up” or “lip down” on the sheet.
  2. The colour requirements

Crank curving

Corrugated material can be crank curved with the same process used for bullnosing but with manual handling in order to achieve the larger radius. In the case of Chromadek sheeting the colour can be specified on either side of the sheet.

Bullnoses will be priced as curves when the radius exceeds 800 mm. The maximum height of curves which can be handled is 2 m with a maximum sheet length of 12 metre.

On-site springing of Roof Sheets

For roofs gently curved on elevation sheets may be sprung on site. However, extreme caution should be used when attempting this procedure to prevent buckling or oil canning.

Bullnoses and centre cranks

Bullnosing and centre cranking of a profiled sheet incorporates lateral rib indentations pressed in at uniform distances. Standard bullnoses are made with the narrow flute uppermost and the bend away from the angular inclination. Reverse bullnoses are made with the narrow flute downwards and with the bend into the narrow flute. Bullnoses and cranks can be at the end of a sheet or at any position along the length.

Bullnoses and centre cranks can be done in a radius from 300 mm to 800 mm for bullnoses which are bent through 0 – 180 degrees, larger radii will be classified as a curve.

The maximum sheet length which can be bullnosed is 15 m, with a maximum height of 2 m. The minimum runout from the bullnose is 30 mm on one side with a minimum of 500 mm on the other side of the sheet.

The critical end of a bullnose must be specified in order to ensure consistent lengths.

Due to handling and transport limitations the maximum height of centre and off-centre cranks which can be manufactured is 2 m with a limitation of 12 m total sheet length.

0.50mm Material can only be bullnosed and cranked to a minimum radius of 450 mm.

Care must be taken when ordering bullnoses and curves as there are no broad or narrow flutes on a Corrugated 10.5 sheeting to differentiate between a normal or reverse bullnose.

Two items must be clearly indicated on a Corrugated 10.5 bullnose:

  1. The position of the “lip up” or “lip down” on the sheet.
  2. The colour requirements

Crank curving

Corrugated material can be crank curved with the same process used for bullnosing but with manual handling in order to achieve the larger radius. In the case of Chromadek sheeting the colour can be specified on either side of the sheet.

Bullnoses will be priced as curves when the radius exceeds 800 mm. The maximum height of curves which can be handled is 2 m with a maximum sheet length of 12 metre.

On-site springing of Roof Sheets

For roofs gently curved on elevation sheets may be sprung on site. However, extreme caution should be used when attempting this procedure to prevent buckling or oil canning.

CENTRE CRANK

centre crank

OFF-CENTRE CRANK

EVE BULLNOSE

EVE BULLNOSE

APEX BULLNOSE

APEX BULLNOSE

DOUBLE BULLNOSE

DOUBLE BULLNOSE

CURVING

CURVING

The following information is required when ordering a Bullnose, Crank or Curve from Staalbeer as per example below:

1. MATERIAL

IBR 0.5 Chromadek

6. LENGTH C

0.050m

2. QUANTITY

17

7. ANGLE

94

3. TOTAL LENGTH

1.850m

8. RADIUS INSIDE

450

4. LENGTH A

1.000m

9. CRITICAL LEG MARK

C

5. LENGTH B

0.800m

10.COLOUR TO

N/F Traffic Green

Staalbeer Deliveries

Staalbeer uses an inhouse delivery fleet consisting of 48 trucks in various load formats to deliver your poduct directly to site. Get a Quote